edu.berkeley.guir.lib.collection
Class WeakHashSet

java.lang.Object
  |
  +--java.util.AbstractCollection
        |
        +--java.util.AbstractSet
              |
              +--edu.berkeley.guir.lib.collection.WeakHashSet

All Implemented Interfaces:

Cloneable, Collection, Serializable, Set

public class WeakHashSet

extends AbstractSet

implements Set, Cloneable, Serializable

Like a WeakHashMap, except that it's a set.

I've found this class to be useful when implementing circularly-referenced objects. The reason is that you want to be able to notify a bunch of objects, which means you need to have a reference to the objects. However, you don't want the notified objects to hang around if you are the only object to have a reference to them. Hence a weak reference, or more specifically, a set of weak references.

This software is distributed under the Berkeley Software License.

 Revisions:  - GUIRLib-v1.0-1.0.0, Dec 08 1999, JH
               Created class
             - GUIRLib-v1.2-1.0.0, Jun 22 2000, JH
               Touched for GUIRLib release
             - GUIRLib-v1.3-1.0.0, Aug 11 2000, JH
               Touched for GUIRLib release
             - GUIRLib-v1.4-1.0.0, Aug 31 2000, JH
               Touched for GUIRLib release
 

Since:

JDK 1.2

Version:

GUIRLib-v1.4-1.0.0, Aug 31 2000

Author:

(jasonh@cs.berkeley.edu)

See Also:

Serialized Form

Constructor Summary

WeakHashSet()

Method Summary

boolean	add(Object obj)
void	clear()
Object	clone() Make a shallow clone.
boolean	contains(Object obj)
boolean	isEmpty()
Iterator	iterator()
boolean	remove(Object obj)
int	size()

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Set

addAll, containsAll, equals, hashCode, removeAll, retainAll, toArray, toArray

Constructor Detail

WeakHashSet

public WeakHashSet()

Method Detail

add

public boolean add(Object obj)

Specified by:

add in interface Set

Overrides:

add in class AbstractCollection

remove

public boolean remove(Object obj)

Specified by:

remove in interface Set

Overrides:

remove in class AbstractCollection

clear

public void clear()

Specified by:

clear in interface Set

Overrides:

clear in class AbstractCollection

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Set

Overrides:

isEmpty in class AbstractCollection

size

public int size()

Specified by:

size in interface Set

Overrides:

size in class AbstractCollection

contains

public boolean contains(Object obj)

Specified by:

contains in interface Set

Overrides:

contains in class AbstractCollection

iterator

public Iterator iterator()

Specified by:

iterator in interface Set

Overrides:

iterator in class AbstractCollection

clone

public Object clone()

Make a shallow clone.

Overrides:

clone in class Object